This is how it works:
-> All 8 undefined cards are shown to you.
-> You click a card.
-> You send request to server saying: "I clicked on card 4" (for example)
-> Server generates randomized items.
-> Server saves the clicked item to your player profile.
-> Server sends data back to player which contains all the randomized details.
There's no way you can:
1) See anything before they are generated.
2) Change the card after seeing the results.
3) Change teh generated results.
I know one trick to get 100% better items from Daily Draw, I will sell the tutorial with step by step guides if anyone is interested.